P2197

DTC P2197: Heated Oxygen Sensor Inactive (bank 2, sensor 1)

TECHNICAL DESCRIPTION

- The ECM effects air/fuel ratio feedback control in accordance with the signals from the left bank heater oxygen sensor (front).

- If the left bank heated oxygen sensor (front) has deteriorated, corrections will be made by the left bank heated oxygen sensor (rear).

- DTC P2197 becomes stored in memory if a failure is detected in the left bank heated oxygen sensor (front).

DESCRIPTIONS OF MONITOR METHODS

Left bank heated oxygen sensor (front) output voltage does not cross lean/rich criteria (about 0.5 volt) within specified period.

MONITOR EXECUTION

Continuous

MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)

- Heated oxygen sensor (front) heater monitor

- Misfire monitor
Sensor (The sensor below is determined to be normal)

- Engine coolant temperature sensor

- Intake air temperature sensor

DTC SET CONDITIONS

Logic Flow Chart






Check Conditions

- More than 350 seconds or more have passed since the engine starting sequence was completed.

- Engine coolant temperature is 7°C (45°F) or more.

- Under the closed loop air/fuel ratio control.

- Intake air temperature is more than -10°C (14°F)
Judgment Criterion

- Left bank heated oxygen sensor (front) output voltage is less than lean/rich criteria
(about 0.5 volt) for 128 seconds.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 21 Monitors, Trips, Drive Cycles and Readiness Codes.

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are: )

- Left bank heated oxygen sensor (front) deteriorated.

- Connector damage.

- Harness damage.

- ECM failed.

DIAGNOSIS

Required Special Tools:

- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.

- MB991827: USB Cable

- MB991910: Main Harness A

STEP 1. Using scan tool MB991958, check data list item AE:
Heated Oxygen Sensor Bank 2, Sensor 1 (left front).





CAUTION:
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

(1)Connect scan tool MB991958 to the data link connector.
(2)Start the engine and run at idle.
(3)Set scan tool MB991958 to the data reading mode for item AE, Heated Oxygen Sensor Bank 2, Sensor 1 (left front).

- Warm up the engine. When the engine is revved, the output voltage should measure 0.6 to 1.0 volt.

- Warm up the engine. When the engine is idling, the output voltage should repeat 0.4 volt or less and 0.6 to 1.0 volt alternately.
(4)Turn
the ignition switch to the "LOCK" (OFF) position.

Q. Is the sensor operating properly?

YES Go to Step 2.

NO Replace it. Then go to Step 3.

STEP 2. Test the OBD-II drive cycle.

(1)Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 21 Monitors, Trips, Drive Cycles and Readiness Codes.

(2)Check the diagnostic trouble code (DTC).

Q. Is DTC P2197 set?

YES Replace the ECM. When the ECM is replaced, register the ID code. Refer to ID registration procedure manual - ID codes registration judgement table [Vehicles with KOS] or ID registration procedure manual - ID codes registration judgement table [Vehicles with WCM]. Then go to Step 3.
NO It can be assumed that this malfunction is intermittent. How to Cope With Intermittent Malfunctions.
STEP 3. Test the OBD-II drive cycle.

(1)Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 21 Monitors, Trips, Drive Cycles and Readiness Codes.

(2)Check the diagnostic trouble code (DTC).

Q. Is DTC P2197 set?

YES Retry the troubleshooting.
NO The inspection is complete.